Typo fix.
[dcpomatic.git] / src / wx / timeline.cc
index 2e368e57d7b6373740efc865e895f0a0538aae79..5a98c829ad8815d3c0cd512c6db09ffd89ebfe72 100644 (file)
 /*
-    Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
+    DCP-o-matic is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
-#include <list>
-#include <wx/graphics.h>
-#include <boost/weak_ptr.hpp>
-#include "lib/film.h"
-#include "lib/playlist.h"
 #include "film_editor.h"
 #include "timeline.h"
+#include "timeline_time_axis_view.h"
+#include "timeline_reels_view.h"
+#include "timeline_labels_view.h"
+#include "timeline_video_content_view.h"
+#include "timeline_audio_content_view.h"
+#include "timeline_text_content_view.h"
+#include "timeline_atmos_content_view.h"
+#include "content_panel.h"
 #include "wx_util.h"
+#include "film_viewer.h"
+#include "lib/film.h"
+#include "lib/playlist.h"
+#include "lib/image_content.h"
+#include "lib/timer.h"
+#include "lib/audio_content.h"
+#include "lib/text_content.h"
+#include "lib/video_content.h"
+#include "lib/atmos_mxf_content.h"
+#include <wx/graphics.h>
+#include <list>
+#include <iterator>
+#include <iostream>
 
 using std::list;
 using std::cout;
+using std::min;
 using std::max;
-using boost::shared_ptr;
-using boost::weak_ptr;
-using boost::dynamic_pointer_cast;
+using std::abs;
+using std::shared_ptr;
+using std::weak_ptr;
+using std::dynamic_pointer_cast;
+using std::make_shared;
 using boost::bind;
 using boost::optional;
-
-/** Parent class for components of the timeline (e.g. a piece of content or an axis) */
-class View : public boost::noncopyable
+using namespace dcpomatic;
+#if BOOST_VERSION >= 106100
+using namespace boost::placeholders;
+#endif
+
+/* 3 hours in 640 pixels */
+double const Timeline::_minimum_pixels_per_second = 640.0 / (60 * 60 * 3);
+int const Timeline::_minimum_pixels_per_track = 16;
+
+Timeline::Timeline (wxWindow* parent, ContentPanel* cp, shared_ptr<Film> film, weak_ptr<FilmViewer> viewer)
+       : wxPanel (parent, wxID_ANY)
+       , _labels_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
+       , _main_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
+       , _content_panel (cp)
+       , _film (film)
+       , _viewer (viewer)
+       , _time_axis_view (new TimelineTimeAxisView (*this, 64))
+       , _reels_view (new TimelineReelsView (*this, 32))
+       , _labels_view (new TimelineLabelsView (*this))
+       , _tracks (0)
+       , _left_down (false)
+       , _down_view_position (0)
+       , _first_move (false)
+       , _menu (this)
+       , _snap (true)
+       , _tool (SELECT)
+       , _x_scroll_rate (16)
+       , _y_scroll_rate (16)
+       , _pixels_per_track (48)
+       , _first_resize (true)
+       , _timer (this)
 {
-public:
-       View (Timeline& t)
-               : _timeline (t)
-       {
-
-       }
-
-       virtual ~View () {}
-               
-       void paint (wxGraphicsContext* g)
-       {
-               _last_paint_bbox = bbox ();
-               do_paint (g);
-       }
-       
-       void force_redraw ()
-       {
-               _timeline.force_redraw (_last_paint_bbox);
-               _timeline.force_redraw (bbox ());
-       }
-
-       virtual dcpomatic::Rect<int> bbox () const = 0;
-
-protected:
-       virtual void do_paint (wxGraphicsContext *) = 0;
-       
-       int time_x (Time t) const
-       {
-               return _timeline.tracks_position().x + t * _timeline.pixels_per_time_unit().get_value_or (0);
-       }
-       
-       Timeline& _timeline;
-
-private:
-       dcpomatic::Rect<int> _last_paint_bbox;
-};
-
+#ifndef __WXOSX__
+       _labels_canvas->SetDoubleBuffered (true);
+       _main_canvas->SetDoubleBuffered (true);
+#endif
+
+       auto sizer = new wxBoxSizer (wxHORIZONTAL);
+       sizer->Add (_labels_canvas, 0, wxEXPAND);
+       _labels_canvas->SetMinSize (wxSize (_labels_view->bbox().width, -1));
+       sizer->Add (_main_canvas, 1, wxEXPAND);
+       SetSizer (sizer);
+
+       _labels_canvas->Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint_labels, this));
+       _main_canvas->Bind   (wxEVT_PAINT,      boost::bind (&Timeline::paint_main,   this));
+       _main_canvas->Bind   (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,    this, _1));
+       _main_canvas->Bind   (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,      this, _1));
+       _main_canvas->Bind   (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,   this, _1));
+       _main_canvas->Bind   (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved,  this, _1));
+       _main_canvas->Bind   (wxEVT_SIZE,       boost::bind (&Timeline::resized,      this));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_TOP,        boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_BOTTOM,     boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_LINEUP,     boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_LINEDOWN,   boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_PAGEUP,     boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_PAGEDOWN,   boost::bind (&Timeline::scrolled,     this, _1));
+       _main_canvas->Bind   (wxEVT_SCROLLWIN_THUMBTRACK, boost::bind (&Timeline::scrolled,     this, _1));
+
+       film_change (ChangeType::DONE, Film::Property::CONTENT);
+
+       SetMinSize (wxSize (640, 4 * pixels_per_track() + 96));
+
+       _film_changed_connection = film->Change.connect (bind (&Timeline::film_change, this, _1, _2));
+       _film_content_change_connection = film->ContentChange.connect (bind (&Timeline::film_content_change, this, _1, _3, _4));
+
+       Bind (wxEVT_TIMER, boost::bind(&Timeline::update_playhead, this));
+       _timer.Start (200, wxTIMER_CONTINUOUS);
+
+       setup_scrollbars ();
+       _labels_canvas->ShowScrollbars (wxSHOW_SB_NEVER, wxSHOW_SB_NEVER);
+}
 
-/** Parent class for views of pieces of content */
-class ContentView : public View
+void
+Timeline::update_playhead ()
 {
-public:
-       ContentView (Timeline& tl, shared_ptr<Content> c)
-               : View (tl)
-               , _content (c)
-               , _selected (false)
-       {
-               _content_connection = c->Changed.connect (bind (&ContentView::content_changed, this, _2, _3));
-       }
-
-       dcpomatic::Rect<int> bbox () const
-       {
-               assert (_track);
-
-               shared_ptr<const Film> film = _timeline.film ();
-               shared_ptr<const Content> content = _content.lock ();
-               if (!film || !content) {
-                       return dcpomatic::Rect<int> ();
-               }
-               
-               return dcpomatic::Rect<int> (
-                       time_x (content->position ()) - 8,
-                       y_pos (_track.get()) - 8,
-                       content->length_after_trim () * _timeline.pixels_per_time_unit().get_value_or(0) + 16,
-                       _timeline.track_height() + 16
-                       );
-       }
-
-       void set_selected (bool s) {
-               _selected = s;
-               force_redraw ();
-       }
-       
-       bool selected () const {
-               return _selected;
-       }
-
-       shared_ptr<Content> content () const {
-               return _content.lock ();
-       }
-
-       void set_track (int t) {
-               _track = t;
-       }
-
-       void unset_track () {
-               _track = boost::optional<int> ();
-       }
-
-       optional<int> track () const {
-               return _track;
-       }
-
-       virtual wxString type () const = 0;
-       virtual wxColour colour () const = 0;
-       
-private:
-
-       void do_paint (wxGraphicsContext* gc)
-       {
-               assert (_track);
-
-               shared_ptr<const Film> film = _timeline.film ();
-               shared_ptr<const Content> cont = content ();
-               if (!film || !cont) {
-                       return;
-               }
-
-               Time const position = cont->position ();
-               Time const len = cont->length_after_trim ();
-
-               wxColour selected (colour().Red() / 2, colour().Green() / 2, colour().Blue() / 2);
+       Refresh ();
+}
 
-               gc->SetPen (*wxBLACK_PEN);
-               
-               gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxPENSTYLE_SOLID));
-               if (_selected) {
-                       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (selected, wxBRUSHSTYLE_SOLID));
-               } else {
-                       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (colour(), wxBRUSHSTYLE_SOLID));
-               }
+void
+Timeline::set_pixels_per_second (double pps)
+{
+       _pixels_per_second = max (_minimum_pixels_per_second, pps);
+}
 
-               wxGraphicsPath path = gc->CreatePath ();
-               path.MoveToPoint    (time_x (position),       y_pos (_track.get()) + 4);
-               path.AddLineToPoint (time_x (position + len), y_pos (_track.get()) + 4);
-               path.AddLineToPoint (time_x (position + len), y_pos (_track.get() + 1) - 4);
-               path.AddLineToPoint (time_x (position),       y_pos (_track.get() + 1) - 4);
-               path.AddLineToPoint (time_x (position),       y_pos (_track.get()) + 4);
-               gc->StrokePath (path);
-               gc->FillPath (path);
-
-               wxString name = wxString::Format (wxT ("%s [%s]"), std_to_wx (cont->path_summary()).data(), type().data());
-               wxDouble name_width;
-               wxDouble name_height;
-               wxDouble name_descent;
-               wxDouble name_leading;
-               gc->GetTextExtent (name, &name_width, &name_height, &name_descent, &name_leading);
-               
-               gc->Clip (wxRegion (time_x (position), y_pos (_track.get()), len * _timeline.pixels_per_time_unit().get_value_or(0), _timeline.track_height()));
-               gc->DrawText (name, time_x (position) + 12, y_pos (_track.get() + 1) - name_height - 4);
-               gc->ResetClip ();
-       }
-
-       int y_pos (int t) const
-       {
-               return _timeline.tracks_position().y + t * _timeline.track_height();
-       }
-
-       void content_changed (int p, bool frequent)
-       {
-               ensure_ui_thread ();
-               
-               if (p == ContentProperty::POSITION || p == ContentProperty::LENGTH) {
-                       force_redraw ();
-               }
+void
+Timeline::paint_labels ()
+{
+       wxPaintDC dc (_labels_canvas);
 
-               if (!frequent) {
-                       _timeline.setup_pixels_per_time_unit ();
-                       _timeline.Refresh ();
-               }
+       auto gc = wxGraphicsContext::Create (dc);
+       if (!gc) {
+               return;
        }
 
-       boost::weak_ptr<Content> _content;
-       optional<int> _track;
-       bool _selected;
+       int vsx, vsy;
+       _labels_canvas->GetViewStart (&vsx, &vsy);
+       gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate + tracks_y_offset());
 
-       boost::signals2::scoped_connection _content_connection;
-};
+       _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 
-class AudioContentView : public ContentView
-{
-public:
-       AudioContentView (Timeline& tl, shared_ptr<Content> c)
-               : ContentView (tl, c)
-       {}
-       
-private:
-       wxString type () const
-       {
-               return _("audio");
-       }
-
-       wxColour colour () const
-       {
-               return wxColour (149, 121, 232, 255);
-       }
-};
+       delete gc;
+}
 
-class VideoContentView : public ContentView
+void
+Timeline::paint_main ()
 {
-public:
-       VideoContentView (Timeline& tl, shared_ptr<Content> c)
-               : ContentView (tl, c)
-       {}
-
-private:       
+       wxPaintDC dc (_main_canvas);
+       _main_canvas->DoPrepareDC (dc);
 
-       wxString type () const
-       {
-               if (dynamic_pointer_cast<FFmpegContent> (content ())) {
-                       return _("video");
-               } else {
-                       return _("still");
-               }
+       auto gc = wxGraphicsContext::Create (dc);
+       if (!gc) {
+               return;
        }
 
-       wxColour colour () const
-       {
-               return wxColour (242, 92, 120, 255);
-       }
-};
+       int vsx, vsy;
+       _main_canvas->GetViewStart (&vsx, &vsy);
+       gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 
-class TimeAxisView : public View
-{
-public:
-       TimeAxisView (Timeline& tl, int y)
-               : View (tl)
-               , _y (y)
-       {}
-       
-       dcpomatic::Rect<int> bbox () const
-       {
-               return dcpomatic::Rect<int> (0, _y - 4, _timeline.width(), 24);
-       }
-
-       void set_y (int y)
-       {
-               _y = y;
-               force_redraw ();
-       }
+       gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 
-private:       
+       for (auto i: _views) {
 
-       void do_paint (wxGraphicsContext* gc)
-       {
-               if (!_timeline.pixels_per_time_unit()) {
-                       return;
-               }
+               auto ic = dynamic_pointer_cast<TimelineContentView> (i);
 
-               double const pptu = _timeline.pixels_per_time_unit().get ();
-               
-               gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxPENSTYLE_SOLID));
-               
-               int mark_interval = rint (128 / (TIME_HZ * pptu));
-               if (mark_interval > 5) {
-                       mark_interval -= mark_interval % 5;
-               }
-               if (mark_interval > 10) {
-                       mark_interval -= mark_interval % 10;
-               }
-               if (mark_interval > 60) {
-                       mark_interval -= mark_interval % 60;
-               }
-               if (mark_interval > 3600) {
-                       mark_interval -= mark_interval % 3600;
-               }
-               
-               if (mark_interval < 1) {
-                       mark_interval = 1;
-               }
+               /* Find areas of overlap with other content views, so that we can plot them */
+               list<dcpomatic::Rect<int>> overlaps;
+               for (auto j: _views) {
+                       auto jc = dynamic_pointer_cast<TimelineContentView> (j);
+                       /* No overlap with non-content views, views on different tracks, audio views or non-active views */
+                       if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
+                               continue;
+                       }
 
-               wxGraphicsPath path = gc->CreatePath ();
-               path.MoveToPoint (_timeline.x_offset(), _y);
-               path.AddLineToPoint (_timeline.width(), _y);
-               gc->StrokePath (path);
-
-               Time t = 0;
-               while ((t * pptu) < _timeline.width()) {
-                       wxGraphicsPath path = gc->CreatePath ();
-                       path.MoveToPoint (time_x (t), _y - 4);
-                       path.AddLineToPoint (time_x (t), _y + 4);
-                       gc->StrokePath (path);
-
-                       int tc = t / TIME_HZ;
-                       int const h = tc / 3600;
-                       tc -= h * 3600;
-                       int const m = tc / 60;
-                       tc -= m * 60;
-                       int const s = tc;
-                       
-                       wxString str = wxString::Format (wxT ("%02d:%02d:%02d"), h, m, s);
-                       wxDouble str_width;
-                       wxDouble str_height;
-                       wxDouble str_descent;
-                       wxDouble str_leading;
-                       gc->GetTextExtent (str, &str_width, &str_height, &str_descent, &str_leading);
-                       
-                       int const tx = _timeline.x_offset() + t * pptu;
-                       if ((tx + str_width) < _timeline.width()) {
-                               gc->DrawText (str, time_x (t), _y + 16);
+                       auto r = j->bbox().intersection(i->bbox());
+                       if (r) {
+                               overlaps.push_back (r.get ());
                        }
-                       
-                       t += mark_interval * TIME_HZ;
                }
-       }
-
-private:
-       int _y;
-};
 
+               i->paint (gc, overlaps);
+       }
 
-Timeline::Timeline (wxWindow* parent, FilmEditor* ed, shared_ptr<Film> film)
-       : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
-       , _film_editor (ed)
-       , _film (film)
-       , _time_axis_view (new TimeAxisView (*this, 32))
-       , _tracks (0)
-       , _left_down (false)
-       , _down_view_position (0)
-       , _first_move (false)
-       , _menu (this)
-       , _snap (true)
-{
-#ifndef __WXOSX__
-       SetDoubleBuffered (true);
-#endif 
+       if (_zoom_point) {
+               /* Translate back as _down_point and _zoom_point do not take scroll into account */
+               gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
+               gc->SetPen (*wxBLACK_PEN);
+               gc->SetBrush (*wxTRANSPARENT_BRUSH);
+               gc->DrawRectangle (
+                       min (_down_point.x, _zoom_point->x),
+                       min (_down_point.y, _zoom_point->y),
+                       abs (_down_point.x - _zoom_point->x),
+                       abs (_down_point.y - _zoom_point->y)
+                       );
+       }
 
-       Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint,       this));
-       Bind (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,   this, _1));
-       Bind (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,     this, _1));
-       Bind (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,  this, _1));
-       Bind (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved, this, _1));
-       Bind (wxEVT_SIZE,       boost::bind (&Timeline::resized,     this));
+       /* Playhead */
 
-       playlist_changed ();
+       auto vp = _viewer.lock ();
+       DCPOMATIC_ASSERT (vp);
 
-       SetMinSize (wxSize (640, tracks() * track_height() + 96));
+       gc->SetPen (*wxRED_PEN);
+       auto path = gc->CreatePath ();
+       double const ph = vp->position().seconds() * pixels_per_second().get_value_or(0);
+       path.MoveToPoint (ph, 0);
+       path.AddLineToPoint (ph, pixels_per_track() * _tracks + 32);
+       gc->StrokePath (path);
 
-       _playlist_changed_connection = film->playlist()->Changed.connect (bind (&Timeline::playlist_changed, this));
-       _playlist_content_changed_connection = film->playlist()->ContentChanged.connect (bind (&Timeline::playlist_content_changed, this, _2));
+       delete gc;
 }
 
 void
-Timeline::paint ()
+Timeline::film_change (ChangeType type, Film::Property p)
 {
-       wxPaintDC dc (this);
-
-       wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
-       if (!gc) {
+       if (type != ChangeType::DONE) {
                return;
        }
 
-       gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
-
-       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-               (*i)->paint (gc);
+       if (p == Film::Property::CONTENT || p == Film::Property::REEL_TYPE || p == Film::Property::REEL_LENGTH) {
+               ensure_ui_thread ();
+               recreate_views ();
+       } else if (p == Film::Property::CONTENT_ORDER) {
+               Refresh ();
        }
-
-       delete gc;
 }
 
 void
-Timeline::playlist_changed ()
+Timeline::recreate_views ()
 {
-       ensure_ui_thread ();
-       
-       shared_ptr<const Film> fl = _film.lock ();
-       if (!fl) {
+       auto film = _film.lock ();
+       if (!film) {
                return;
        }
 
        _views.clear ();
        _views.push_back (_time_axis_view);
+       _views.push_back (_reels_view);
 
-       ContentList content = fl->playlist()->content ();
+       for (auto i: film->content ()) {
+               if (i->video) {
+                       _views.push_back (make_shared<TimelineVideoContentView>(*this, i));
+               }
 
-       for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
-               if (dynamic_pointer_cast<VideoContent> (*i)) {
-                       _views.push_back (shared_ptr<View> (new VideoContentView (*this, *i)));
+               if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
+                       _views.push_back (make_shared<TimelineAudioContentView>(*this, i));
                }
-               if (dynamic_pointer_cast<AudioContent> (*i)) {
-                       _views.push_back (shared_ptr<View> (new AudioContentView (*this, *i)));
+
+               for (auto j: i->text) {
+                       _views.push_back (make_shared<TimelineTextContentView>(*this, i, j));
+               }
+
+               if (i->atmos) {
+                       _views.push_back (make_shared<TimelineAtmosContentView>(*this, i));
                }
        }
 
        assign_tracks ();
-       setup_pixels_per_time_unit ();
+       setup_scrollbars ();
        Refresh ();
 }
 
 void
-Timeline::playlist_content_changed (int property)
+Timeline::film_content_change (ChangeType type, int property, bool frequent)
 {
+       if (type != ChangeType::DONE) {
+               return;
+       }
+
        ensure_ui_thread ();
 
-       if (property == ContentProperty::POSITION) {
-               assign_tracks ();
-               setup_pixels_per_time_unit ();
+       if (property == AudioContentProperty::STREAMS || property == VideoContentProperty::FRAME_TYPE) {
+               recreate_views ();
+       } else if (property == ContentProperty::POSITION || property == ContentProperty::LENGTH) {
+               _reels_view->force_redraw ();
+       } else if (!frequent) {
+               setup_scrollbars ();
                Refresh ();
        }
 }
 
-void
-Timeline::assign_tracks ()
+template <class T>
+int
+place (shared_ptr<const Film> film, TimelineViewList& views, int& tracks)
 {
-       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-               shared_ptr<ContentView> c = dynamic_pointer_cast<ContentView> (*i);
-               if (c) {
-                       c->unset_track ();
-               }
-       }
+       int const base = tracks;
 
-       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
-               if (!cv) {
+       for (auto i: views) {
+               if (!dynamic_pointer_cast<T>(i)) {
                        continue;
                }
 
-               shared_ptr<Content> content = cv->content();
+               auto cv = dynamic_pointer_cast<TimelineContentView> (i);
+
+               int t = base;
+
+               auto content = cv->content();
+               DCPTimePeriod const content_period (content->position(), content->end(film));
 
-               int t = 0;
                while (true) {
-                       ViewList::iterator j = _views.begin();
-                       while (j != _views.end()) {
-                               shared_ptr<ContentView> test = dynamic_pointer_cast<ContentView> (*j);
+                       auto j = views.begin();
+                       while (j != views.end()) {
+                               auto test = dynamic_pointer_cast<T> (*j);
                                if (!test) {
                                        ++j;
                                        continue;
                                }
-                               
-                               shared_ptr<Content> test_content = test->content();
-                                       
-                               if (test && test->track() && test->track().get() == t) {
-                                       bool const no_overlap =
-                                               (content->position() < test_content->position() && content->end() < test_content->position()) ||
-                                               (content->position() > test_content->end()      && content->end() > test_content->end());
-                                       
-                                       if (!no_overlap) {
-                                               /* we have an overlap on track `t' */
-                                               ++t;
-                                               break;
-                                       }
+
+                               auto test_content = test->content();
+                               if (
+                                       test->track() && test->track().get() == t &&
+                                       content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end(film)))) {
+                                       /* we have an overlap on track `t' */
+                                       ++t;
+                                       break;
                                }
-                               
+
                                ++j;
                        }
 
-                       if (j == _views.end ()) {
+                       if (j == views.end ()) {
                                /* no overlap on `t' */
                                break;
                        }
                }
 
                cv->set_track (t);
-               _tracks = max (_tracks, t + 1);
+               tracks = max (tracks, t + 1);
+       }
+
+       return tracks - base;
+}
+
+/** Compare the mapped output channels of two TimelineViews, so we can into
+ *  order of first mapped DCP channel.
+ */
+struct AudioMappingComparator {
+       bool operator()(shared_ptr<TimelineView> a, shared_ptr<TimelineView> b) {
+               int la = -1;
+               auto cva = dynamic_pointer_cast<TimelineAudioContentView>(a);
+               if (cva) {
+                       auto oc = cva->content()->audio->mapping().mapped_output_channels();
+                       la = *min_element(boost::begin(oc), boost::end(oc));
+               }
+               int lb = -1;
+               auto cvb = dynamic_pointer_cast<TimelineAudioContentView>(b);
+               if (cvb) {
+                       auto oc = cvb->content()->audio->mapping().mapped_output_channels();
+                       lb = *min_element(boost::begin(oc), boost::end(oc));
+               }
+               return la < lb;
+       }
+};
+
+void
+Timeline::assign_tracks ()
+{
+       /* Tracks are:
+          Video (mono or left-eye)
+          Video (right-eye)
+          Text 1
+          Text 2
+          Text N
+          Atmos
+          Audio 1
+          Audio 2
+          Audio N
+       */
+
+       auto film = _film.lock ();
+       DCPOMATIC_ASSERT (film);
+
+       _tracks = 0;
+
+       for (auto i: _views) {
+               auto c = dynamic_pointer_cast<TimelineContentView>(i);
+               if (c) {
+                       c->unset_track ();
+               }
+       }
+
+       /* Video */
+
+       bool have_3d = false;
+       for (auto i: _views) {
+               auto cv = dynamic_pointer_cast<TimelineVideoContentView>(i);
+               if (!cv) {
+                       continue;
+               }
+
+               /* Video on tracks 0 and maybe 1 (left and right eye) */
+               if (cv->content()->video->frame_type() == VideoFrameType::THREE_D_RIGHT) {
+                       cv->set_track (1);
+                       _tracks = max (_tracks, 2);
+                       have_3d = true;
+               } else {
+                       cv->set_track (0);
+               }
        }
 
-       _time_axis_view->set_y (tracks() * track_height() + 32);
+       _tracks = max (_tracks, 1);
+
+       /* Texts */
+
+       int const text_tracks = place<TimelineTextContentView> (film, _views, _tracks);
+
+       /* Atmos */
+
+       bool have_atmos = false;
+       for (auto i: _views) {
+               auto cv = dynamic_pointer_cast<TimelineAtmosContentView>(i);
+               if (cv) {
+                       cv->set_track (_tracks);
+                       have_atmos = true;
+               }
+       }
+
+       if (have_atmos) {
+               ++_tracks;
+       }
+
+       /* Audio.  We're sorting the views so that we get the audio views in order of increasing
+          DCP channel index.
+       */
+
+       auto views = _views;
+       sort(views.begin(), views.end(), AudioMappingComparator());
+       int const audio_tracks = place<TimelineAudioContentView> (film, views, _tracks);
+
+       _labels_view->set_3d (have_3d);
+       _labels_view->set_audio_tracks (audio_tracks);
+       _labels_view->set_text_tracks (text_tracks);
+       _labels_view->set_atmos (have_atmos);
+
+       _time_axis_view->set_y (tracks());
+       _reels_view->set_y (8);
 }
 
 int
@@ -495,27 +457,38 @@ Timeline::tracks () const
 }
 
 void
-Timeline::setup_pixels_per_time_unit ()
+Timeline::setup_scrollbars ()
 {
-       shared_ptr<const Film> film = _film.lock ();
-       if (!film || film->length() == 0) {
+       auto film = _film.lock ();
+       if (!film || !_pixels_per_second) {
                return;
        }
 
-       _pixels_per_time_unit = static_cast<double>(width() - x_offset() * 2) / film->length ();
+       int const h = tracks() * pixels_per_track() + tracks_y_offset() + _time_axis_view->bbox().height;
+
+       _labels_canvas->SetVirtualSize (_labels_view->bbox().width, h);
+       _labels_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
+       _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), h);
+       _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 }
 
-shared_ptr<View>
+shared_ptr<TimelineView>
 Timeline::event_to_view (wxMouseEvent& ev)
 {
-       ViewList::iterator i = _views.begin();
-       Position<int> const p (ev.GetX(), ev.GetY());
-       while (i != _views.end() && !(*i)->bbox().contains (p)) {
+       /* Search backwards through views so that we find the uppermost one first */
+       auto i = _views.rbegin();
+
+       int vsx, vsy;
+       _main_canvas->GetViewStart (&vsx, &vsy);
+       Position<int> const p (ev.GetX() + vsx * _x_scroll_rate, ev.GetY() + vsy * _y_scroll_rate);
+
+       while (i != _views.rend() && !(*i)->bbox().contains (p)) {
+               auto cv = dynamic_pointer_cast<TimelineContentView>(*i);
                ++i;
        }
 
-       if (i == _views.end ()) {
-               return shared_ptr<View> ();
+       if (i == _views.rend ()) {
+               return {};
        }
 
        return *i;
@@ -524,8 +497,27 @@ Timeline::event_to_view (wxMouseEvent& ev)
 void
 Timeline::left_down (wxMouseEvent& ev)
 {
-       shared_ptr<View> view = event_to_view (ev);
-       shared_ptr<ContentView> content_view = dynamic_pointer_cast<ContentView> (view);
+       _left_down = true;
+       _down_point = ev.GetPosition ();
+
+       switch (_tool) {
+       case SELECT:
+               left_down_select (ev);
+               break;
+       case ZOOM:
+       case ZOOM_ALL:
+       case SNAP:
+       case SEQUENCE:
+               /* Nothing to do */
+               break;
+       }
+}
+
+void
+Timeline::left_down_select (wxMouseEvent& ev)
+{
+       auto view = event_to_view (ev);
+       auto content_view = dynamic_pointer_cast<TimelineContentView>(view);
 
        _down_view.reset ();
 
@@ -534,18 +526,14 @@ Timeline::left_down (wxMouseEvent& ev)
                _down_view_position = content_view->content()->position ();
        }
 
-       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+       for (auto i: _views) {
+               auto cv = dynamic_pointer_cast<TimelineContentView>(i);
                if (!cv) {
                        continue;
                }
-               
+
                if (!ev.ShiftDown ()) {
-                       cv->set_selected (view == *i);
-               }
-               
-               if (view == *i) {
-                       _film_editor->set_selection (cv->content ());
+                       cv->set_selected (view == i);
                }
        }
 
@@ -553,11 +541,30 @@ Timeline::left_down (wxMouseEvent& ev)
                content_view->set_selected (!content_view->selected ());
        }
 
-       _left_down = true;
-       _down_point = ev.GetPosition ();
        _first_move = false;
 
        if (_down_view) {
+               /* Pre-compute the points that we might snap to */
+               for (auto i: _views) {
+                       auto cv = dynamic_pointer_cast<TimelineContentView>(i);
+                       if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
+                               continue;
+                       }
+
+                       auto film = _film.lock ();
+                       DCPOMATIC_ASSERT (film);
+
+                       _start_snaps.push_back (cv->content()->position());
+                       _end_snaps.push_back (cv->content()->position());
+                       _start_snaps.push_back (cv->content()->end(film));
+                       _end_snaps.push_back (cv->content()->end(film));
+
+                       for (auto i: cv->content()->reel_split_points(film)) {
+                               _start_snaps.push_back (i);
+                       }
+               }
+
+               /* Tell everyone that things might change frequently during the drag */
                _down_view->content()->set_change_signals_frequent (true);
        }
 }
@@ -567,15 +574,102 @@ Timeline::left_up (wxMouseEvent& ev)
 {
        _left_down = false;
 
+       switch (_tool) {
+       case SELECT:
+               left_up_select (ev);
+               break;
+       case ZOOM:
+               left_up_zoom (ev);
+               break;
+       case ZOOM_ALL:
+       case SNAP:
+       case SEQUENCE:
+               break;
+       }
+}
+
+void
+Timeline::left_up_select (wxMouseEvent& ev)
+{
        if (_down_view) {
                _down_view->content()->set_change_signals_frequent (false);
        }
 
-       set_position_from_event (ev);
+       _content_panel->set_selection (selected_content ());
+       /* Since we may have just set change signals back to `not-frequent', we have to
+          make sure this position change is signalled, even if the position value has
+          not changed since the last time it was set (with frequent=true).  This is
+          a bit of a hack.
+       */
+       set_position_from_event (ev, true);
+
+       /* Clear up up the stuff we don't do during drag */
+       assign_tracks ();
+       setup_scrollbars ();
+       Refresh ();
+
+       _start_snaps.clear ();
+       _end_snaps.clear ();
+}
+
+void
+Timeline::left_up_zoom (wxMouseEvent& ev)
+{
+       _zoom_point = ev.GetPosition ();
+
+       int vsx, vsy;
+       _main_canvas->GetViewStart (&vsx, &vsy);
+
+       wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
+       wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
+
+       if ((bottom_right.x - top_left.x) < 8 || (bottom_right.y - top_left.y) < 8) {
+               /* Very small zoom rectangle: we assume it wasn't intentional */
+               return;
+       }
+
+       auto const time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
+       auto const time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
+       set_pixels_per_second (double(GetSize().GetWidth()) / (time_right.seconds() - time_left.seconds()));
+
+       double const tracks_top = double(top_left.y - tracks_y_offset()) / _pixels_per_track;
+       double const tracks_bottom = double(bottom_right.y - tracks_y_offset()) / _pixels_per_track;
+       set_pixels_per_track (lrint(GetSize().GetHeight() / (tracks_bottom - tracks_top)));
+
+       setup_scrollbars ();
+       int const y = (tracks_top * _pixels_per_track + tracks_y_offset()) / _y_scroll_rate;
+       _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, y);
+       _labels_canvas->Scroll (0, y);
+
+       _zoom_point = optional<wxPoint> ();
+       Refresh ();
+}
+
+void
+Timeline::set_pixels_per_track (int h)
+{
+       _pixels_per_track = max(_minimum_pixels_per_track, h);
 }
 
 void
 Timeline::mouse_moved (wxMouseEvent& ev)
+{
+       switch (_tool) {
+       case SELECT:
+               mouse_moved_select (ev);
+               break;
+       case ZOOM:
+               mouse_moved_zoom (ev);
+               break;
+       case ZOOM_ALL:
+       case SNAP:
+       case SEQUENCE:
+               break;
+       }
+}
+
+void
+Timeline::mouse_moved_select (wxMouseEvent& ev)
 {
        if (!_left_down) {
                return;
@@ -584,11 +678,43 @@ Timeline::mouse_moved (wxMouseEvent& ev)
        set_position_from_event (ev);
 }
 
+void
+Timeline::mouse_moved_zoom (wxMouseEvent& ev)
+{
+       if (!_left_down) {
+               return;
+       }
+
+       _zoom_point = ev.GetPosition ();
+       Refresh ();
+}
+
 void
 Timeline::right_down (wxMouseEvent& ev)
 {
-       shared_ptr<View> view = event_to_view (ev);
-       shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (view);
+       switch (_tool) {
+       case SELECT:
+               right_down_select (ev);
+               break;
+       case ZOOM:
+               /* Zoom out */
+               set_pixels_per_second (*_pixels_per_second / 2);
+               set_pixels_per_track (_pixels_per_track / 2);
+               setup_scrollbars ();
+               Refresh ();
+               break;
+       case ZOOM_ALL:
+       case SNAP:
+       case SEQUENCE:
+               break;
+       }
+}
+
+void
+Timeline::right_down_select (wxMouseEvent& ev)
+{
+       auto view = event_to_view (ev);
+       auto cv = dynamic_pointer_cast<TimelineContentView> (view);
        if (!cv) {
                return;
        }
@@ -598,19 +724,28 @@ Timeline::right_down (wxMouseEvent& ev)
                cv->set_selected (true);
        }
 
-       _menu.popup (_film, selected_content (), ev.GetPosition ());
+       _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
+}
+
+void
+Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
+{
+       auto const d = a - b;
+       if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
+               nearest_distance = d;
+       }
 }
 
 void
-Timeline::set_position_from_event (wxMouseEvent& ev)
+Timeline::set_position_from_event (wxMouseEvent& ev, bool force_emit)
 {
-       if (!_pixels_per_time_unit) {
+       if (!_pixels_per_second) {
                return;
        }
 
-       double const pptu = _pixels_per_time_unit.get ();
+       double const pps = _pixels_per_second.get ();
 
-       wxPoint const p = ev.GetPosition();
+       auto const p = ev.GetPosition();
 
        if (!_first_move) {
                /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
@@ -626,66 +761,50 @@ Timeline::set_position_from_event (wxMouseEvent& ev)
        if (!_down_view) {
                return;
        }
-       
-       Time new_position = _down_view_position + (p.x - _down_point.x) / pptu;
-       
+
+       auto new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
+
+       auto film = _film.lock ();
+       DCPOMATIC_ASSERT (film);
+
        if (_snap) {
-               
-               bool first = true;
-               Time nearest_distance = TIME_MAX;
-               Time nearest_new_position = TIME_MAX;
-               
-               /* Find the nearest content edge; this is inefficient */
-               for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-                       shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
-                       if (!cv || cv == _down_view) {
-                               continue;
-                       }
-                       
-                       {
-                               /* Snap starts to ends */
-                               Time const d = abs (cv->content()->end() - new_position);
-                               if (first || d < nearest_distance) {
-                                       nearest_distance = d;
-                                       nearest_new_position = cv->content()->end() + 1;
-                               }
-                       }
-                       
-                       {
-                               /* Snap ends to starts */
-                               Time const d = abs (cv->content()->position() - (new_position + _down_view->content()->length_after_trim()));
-                               if (d < nearest_distance) {
-                                       nearest_distance = d;
-                                       nearest_new_position = cv->content()->position() - _down_view->content()->length_after_trim () - 1;
-                               }
-                       }
-                       
-                       first = false;
+               auto const new_end = new_position + _down_view->content()->length_after_trim(film);
+               /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
+                  positive is right).
+               */
+               optional<DCPTime> nearest_distance;
+
+               /* Find the nearest snap point */
+
+               for (auto i: _start_snaps) {
+                       maybe_snap (i, new_position, nearest_distance);
                }
-               
-               if (!first) {
+
+               for (auto i: _end_snaps) {
+                       maybe_snap (i, new_end, nearest_distance);
+               }
+
+               if (nearest_distance) {
                        /* Snap if it's close; `close' means within a proportion of the time on the timeline */
-                       if (nearest_distance < (width() / pptu) / 32) {
-                               new_position = nearest_new_position;
+                       if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
+                               new_position += nearest_distance.get ();
                        }
                }
        }
-       
-       if (new_position < 0) {
-               new_position = 0;
+
+       if (new_position < DCPTime ()) {
+               new_position = DCPTime ();
        }
 
-       _down_view->content()->set_position (new_position);
-       
-       shared_ptr<Film> film = _film.lock ();
-       assert (film);
-       film->set_sequence_video (false);
+       _down_view->content()->set_position (film, new_position, force_emit);
+
+       film->set_sequence (false);
 }
 
 void
 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 {
-       RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
+       _main_canvas->RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 }
 
 shared_ptr<const Film>
@@ -697,27 +816,31 @@ Timeline::film () const
 void
 Timeline::resized ()
 {
-       setup_pixels_per_time_unit ();
+       if (_main_canvas->GetSize().GetWidth() > 0 && _first_resize) {
+               zoom_all ();
+               _first_resize = false;
+       }
+       setup_scrollbars ();
 }
 
 void
 Timeline::clear_selection ()
 {
-       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
-               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+       for (auto i: _views) {
+               shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView>(i);
                if (cv) {
                        cv->set_selected (false);
                }
        }
 }
 
-Timeline::ContentViewList
+TimelineContentViewList
 Timeline::selected_views () const
 {
-       ContentViewList sel;
-       
-       for (ViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
-               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+       TimelineContentViewList sel;
+
+       for (auto i: _views) {
+               auto cv = dynamic_pointer_cast<TimelineContentView>(i);
                if (cv && cv->selected()) {
                        sel.push_back (cv);
                }
@@ -730,11 +853,74 @@ ContentList
 Timeline::selected_content () const
 {
        ContentList sel;
-       ContentViewList views = selected_views ();
-       
-       for (ContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
-               sel.push_back ((*i)->content ());
+
+       for (auto i: selected_views()) {
+               sel.push_back(i->content());
        }
 
        return sel;
 }
+
+void
+Timeline::set_selection (ContentList selection)
+{
+       for (auto i: _views) {
+               auto cv = dynamic_pointer_cast<TimelineContentView> (i);
+               if (cv) {
+                       cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
+               }
+       }
+}
+
+int
+Timeline::tracks_y_offset () const
+{
+       return _reels_view->bbox().height + 4;
+}
+
+int
+Timeline::width () const
+{
+       return _main_canvas->GetVirtualSize().GetWidth();
+}
+
+void
+Timeline::scrolled (wxScrollWinEvent& ev)
+{
+       if (ev.GetOrientation() == wxVERTICAL) {
+               int x, y;
+               _main_canvas->GetViewStart (&x, &y);
+               _labels_canvas->Scroll (0, y);
+       }
+       ev.Skip ();
+}
+
+void
+Timeline::tool_clicked (Tool t)
+{
+       switch (t) {
+       case ZOOM:
+       case SELECT:
+               _tool = t;
+               break;
+       case ZOOM_ALL:
+               zoom_all ();
+               break;
+       case SNAP:
+       case SEQUENCE:
+               break;
+       }
+}
+
+void
+Timeline::zoom_all ()
+{
+       auto film = _film.lock ();
+       DCPOMATIC_ASSERT (film);
+       set_pixels_per_second ((_main_canvas->GetSize().GetWidth() - 32) / film->length().seconds());
+       set_pixels_per_track ((_main_canvas->GetSize().GetHeight() - tracks_y_offset() - _time_axis_view->bbox().height - 32) / _tracks);
+       setup_scrollbars ();
+       _main_canvas->Scroll (0, 0);
+       _labels_canvas->Scroll (0, 0);
+       Refresh ();
+}